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The 56-year-old inmate was checked into Harborview Medical Center on April 14. The county did not report the reason for the hospitalization in its statement.

The man had been booked into jail on July 3 last year and was charged with felony assault.

The King County Medical Examiner's Office will identify the man and determine the cause and manner of his death.

Per policy, Public Health - Seattle and King County will perform an internal investigation with the Department of Adult and Juvenile Detention. The Seattle Police Department will perform an independent review.